[MacPorts] #60139: Guile 3 is out

[MacPorts]

#60139: Guile 3 is out
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  Reporter:  casouri  |      Owner:  (none)
      Type:  update   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.6.2
Resolution:           |   Keywords:
      Port:  guile    |
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Comment (by szhorvat):

 I gave up on this, but I'll add a few notes in the hope that they'll save
 others some time.

 Several of the current ports do not work with guile 3.0. In many cases,
 the first problem is that their build system looks specifically for
 version 2.2. Therefore, it would make sense to provide three versions
 concurrently: `guile18` (existing) `guile22` (current version should be
 renamed) and `guile` 3.0. Guile supports parallel installations:
 https://www.gnu.org/software/guile/manual/html_node/Parallel-
 Installations.html

 The `--program-suffix` option can be used to add `22` to the end of all
 executable names. It will rename most, but not all things that may
 conflict. The `guile18` port does not use this mechanism, I do not know
 why. Perhaps guile's configure script didn't support it at that time. But
 it can be used for version 2.2.  Note that not everything will be renamed
 accordingly. Notably, the texinfo documentation pages and `guile.m4` need
 to be renamed manually or deleted (see how `guile18` does this).

 After this is done, not everything will be working as it should when
 version 3.0 and 2.2 are installed concurrently. Some dependent ports will
 detect the `guile-2.2` _libraries_, but will pick up the `guile` (i.e.
 version 3.0) executable instead of `guile22` and throw an error due to the
 version mismatch. This is possibly because of the installed `guile.m4`
 file, which provides information to the configure script. I don't have
 enough knowledge about autoconf to be able to patch this, but I note that
 `guile18` patches it extensively.

 Some dependents are old an unmaintained, e.g. `g-wrap` had its last
 release in 2015. I wouldn't hold my breath to see these updated for guile
 3.0 compatibility. The build systems of these likely will also need
 patching do actually pick up version 2.2.

 Most dependents of `guile` in MacPorts are `nomaintainer`.

-- 
Ticket URL: <https://trac.macports.org/ticket/60139#comment:6>
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